Charles m



Patntedlan. ID, I899.

No. 6l7,52l.

' c. I m. DAY.

BOILER FURNACE.

(Application filed June 9, 1898;)

(No Model.)

nN N 8 1 w M W m I No NQ o W 0 INI Nv\ A 7 H50 UNITED STATES PATENT OFFICE.

CHARLES M. DAY, OF NEIV YORK, N. Y., ASSIGNOR TO ALBERT A. DAY, OF SAME PLACE.

BOILER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 617,521, dated January 10, 1899.

Application filed June 9, 1893. Serial No. 683,008. (No model.)

T0 on whom it may concern:

Be it known that I, CHARLES M. DAY, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Boiler-Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention is an improvement in boiler furnaces or settings; and it consists in the novel features hereinafter described, reference being had to the accompanying drawings, which illustrate one form in which I have contemplated embodying my invention, and said invention is fully disclosed in the following description and claims.

, In the drawings, Figure 1 represents a vertical sectional view of a boiler-setting embodying my invention, and Fig. 2 represents a horizontal section of the same.

In the drawings, A represents the side or vertical walls of the setting, which at their forward ends are preferably inclined toward each other, as shown at a, and are connected by an arch or horizontal section a;

B represents the bridge-wall, which extends transversely of the walls A A, and 0 represents the front wall of the furnace, provided with a front plate 0, the wall 0 being provided with a main door-opening o and ash-pit opening 0, and said front plate being provided with the furnace-door c and ash-pit door 0 D represents the grate, extending from the front wall to the bridge-wall and lying below the overhanging portion or arch a, between which and the grate is formed whatI term the combustionchamber E, while below the grate is the ash-pit F;

G represents the boiler, of the pattern known as a return tubular boiler, provided with the usual fire-tubes g. The front end of the boiler may extend a greater or less distance over the combustion-chamber, as may be found necessary or convenient.

H represents the back wall of the furnace or setting, provided with a closing-plate h for forcing the products of combustion into the does not, however, extend downwardly to the bottom of the rear portion of the furnace or setting, and forward of the partition I is a parallel wall or partition K, extending from the bottom of the setting upward to a point near the bottom of the boiler, the upper face of the wall K conforming to the shape of the bottom of the boiler. It will thus be seen that the products of combustion will be forced to pass through a somewhat contracted opening 7t, formed above the wall K, and thence to pass downward through a narrow vertical passage and beneath the partition I into the rear space h at the rear end of the boilersetting, the said space h being of greater size than the passage 7.2, as shown. The products of combustion in passing downwardly through the narrow passage between the partitions I K carry the ash downwardly with considerable force, and the products of com bustion as they enter the larger passage h in rear of partition I and begin to ascend will expand or spread out slightly, thus causing them to drop the ash, which settles in the lower part of the rear portion of the furnace.

L represents a rearwardly-inclined floor or surface, preferably of fire-brick, extending from the top of the bridge-wall B to a point adjacent to the bottom of the partition K, said floor or surface L having its central portion depressed below its side portions, as shown in the drawings, so as to form achute or hopper to conduct the fine ash falling thereon to its lowest portion, which will be at the center, adjacent to the bottom of the wall K. In order to rapidly remove the accumulated ash when desired, I provide a horizontal discharge-tube M, which extends from an opening at the lowest portion of the ash-receiving floor L to a point outside of the furnace, and I provide also a small pipe N, which is extended into and provided with a dischargenozzle within the inner end of the tube M, so that when steam, air, or other fluid under pressure is forced through the pipe N it will act as an injector in drawing the ash into the tube M and discharging it outside of the fur- I00 nace. I also provide the portion of the furnace in rear of the partition K with a hoppershaped bottom 0, having a discharge-orifice in the center at its lowest part, which is provided with an ash-discharging tube P and pipe Q, constructed and operating exactly similar to the tube M and pipe N just described.

This improved furnace or boiler-setting is particularly designed for use in connection with means for supplying fuel in a more or less finely divided condition, which is delivered into the combustion-chamber E by means of a suitable nozzle, such as is indicated in the drawings at S. It will be noted that the combustionchamber E is forward of the portions of the boiler which are directly exposed to the action of' the flames and products of combustion, the said combustion-chamberbeing surrounded on three sides with fire-brick walls. These walls become intensely heated during the combustion of the finely-divided fuel, and the heat from said walls is radiated and imparted to the fresh fuel as it is introduced into the combustion-chamber, thus assisting greatly in producing the instantaneous combustion of the fuel while the particles are suspended between the grate and the arch above the same. The ash resulting from the combustion of this finely-divided fuel is in the form of a fine impalpable dust or powder having very little cohesiveness, so that it can be readily discharged by an injector apparatus of the kind described.

It will be noted that the inner faces of the side walls at the front of the furnace incline toward each other and that the nozzle S is introduced into the combustion-chamber at its narrowest point. As a result of this construction the side walls of the chamber will conform to the shape of the stream of finelydivided fuel which is discharged from the nozzle, thus preventing the formation of eddies or dead-spaces which would otherwise occur and which in some cases interfere with a perfect operation of the furnace. The lateral portions of the stream of material will pass in close proximity to these inclined walls, which during the use of the furnace are intensely heated, and the walls will therefore impart a high degree of heat to the adjacent material, thus facilitating the combustion of the same. Moreover, if the front part of the grate were considerably wider than the stream of fuel issuing from the nozzle the forward corners of the grate would remain free and uncovered and currents of air would flow upward through the spaces so formed, which would interfere with the proper operation of the nozzle. It is therefore desirable that the whole grate should be within the range of the nozzle and remain continually covered with fuel.

\Vhile I have shown a return-tube boiler in connection with my improved furnace or boiler-setting, the latter is adapted for use with any desired style or kind of boiler.

In the use of this form of furnace the portions of the finely-divided fuel in the form of incandescent or burning particles or highlyheated ash will be deposited upon the floor L in rear of the bridge-wall and on the hopperbottom 0, which will give 0% their heat to the boiler, so that I have a large heat-radiating surface in rear of the combustion-chamber.

The heated products of combustion are also throttled somewhat by the narrow passages 7.; and 7t, thus causing them to pass more slowly along the bottom of the boiler, so as to give up their heat more effectively thereto, while the ash carried by the products of combustion in rear of the combustion-chamber will be collected upon the inclined bottom L and hopper-bottom 0, from which it can be removed at suitable intervals through the tubes M and P by means of the injectors N and Q.

Vhat I claim, and desire to secure by Letters Patent, is-

1. A boiler-furnace provided at its rear wall with a vertical transverse partition extending from the boiler downwardly to a point near the bottom of the furnace, a second vertical transverse partition forward of said first-named partition,extending from the bottom of the furnace to near the bottom of the boiler, the distance between the said partitions being less than the distance between the rear wall of the furnace and said firstnamed partition, whereby the products of combustion will be carried downward through the narrow passage between said partitions and allowed to expand in the rear of said partitions, to deposit the ash and means for removing said ash, substantially as described.

2. A boiler-furnace provided adjacent its rear wall with a vertically-disposed transverse partition extending to a pointy near the bottom of the furnace, and a vertical transverse partition forward of said first-named partition extending from the bottom of the furnace nearly to the bottom of the boiler, said partitions forming a vertical passage down which the products of combustion are conducted to allow the ash carried thereby to be deposited, a discharge-tube for the said ash, and an injector for said discharge-tube, substantially as described.

3. Aboiler-furnaee provided at its front end with a combustion-chamber and having adjacent to its rear wall parallel vertical transverse partitions for conducting the products of combustion downwardly between the same and an inclined bottom extending downwardly from the combustion-chamber to one of said partitions, substantially as described.

4:. A boiler-furnace provided atits front end with a combustion-chamber, and adjacent to its rear wall with parallel vertical transverse partitions for causing the products of combustion to travel downwardly to deposit the ash carried thereby, an inclined bottom extending from the combustion-chamber down wardly to one of said partitions, a discharge tube adjacent to the lowest portion of said inclined bottom, a discharge-tube in rear of said partitions and injectors for said discharge-tubes, substantially as described.

5. A boiler-furnace provided with a combustion-chamberhaving the inner portions of its side walls converging toward the front of the chamber, a horizontal grate in said chamber extending from one of said inclined walls to the other, a discharge-nozzle located at the narrower end of said chamber for feeding finely-divided fuel into said chamber, whereby the formation of eddies at the front of the chamber is avoided and the entire grate is within the range of the said nozzle, substantially as described. I

6. A boiler-furnace for consuming finelydivided fuel, provided with a discharge-tube for ash, and an injector for said dischargetube, substantially as described.

7. A boiler-furnace for consuming finelydivided fuel, provided with a combustionchamber at its front end, and adjacent to its rear wall with parallel vertical transverse partitions forming a passage for conducting the products of combustion downwardly to deposit the ash carried thereby, an ash-receiving hopper-bottom in rear of the said partitions provided with a discharge-aperture adjacent to its lowest portion, a dischargetube communicating with said aperture, an inclined ash-receiving floor extending from said combustion-chamber downwardly to one of said partitions and having a dischargeaperture adjacent to its lowest portion, a discharge-tube communicating with said aperture, and injectors for said discharge-tubes, substantially as described.

In testimony whereof I affix my signature in the presence of two witnesses.

CHARLES M. DAY.

\Vitnesses:

L. P. WHITAKER, J. D. KINGSBERY. 

